A box of mass m = 51 kg is being pulled by a constant force F = 101 N at an angle q = 15 degrees. (A) If the kinetic friction coefficient was m = 0.19 between the box and the surface, what is the magnitude of the friction force? What is the direction of the friction force? (B) What is the magnitude of the total, or net, force acting on the box?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”